Motor-cycle driving-belt.



G. T. L. VON RABENAU. MOTOR CYCLE DRIVING BELT.

APPLICATION FILED JULY 17, 1911.

Patented June 4, 1912.

' h ITNESSES:

UNITED STATES PATENT OFFICE.

com. TnEononLEonARD von RAIBENAU, or ISLINGTON, ENGLAND.

HECTOR-CYCLE DRIVING- BELT.

To all whom it may concern: I

Be it known that I, CU-RT Tmtonon LEON- ARD voN RABENAU, a subject of the German Emperor, residing at 207 Pentonville road, Islington, in the county of London, England, have invented certain new and useful Improvements in Motor-Cycle Driving- Belts, for which I have obtained a patent in.

Great Britain, No. 17433, bearing date July 22, 1910, of which the following 1s a'specification.

My'invention relates to the thick and nar- I belts used onrow wedge "shaped driving motor cycles or machines using grooved pulleys, which belts are intended to drive entirely or mainly by frictional contact between the sides of the belt andthe inclined side faces of the pulleys.

tinuous. -By suitably arranging these studsin combination .with other features, described hereinafter, the f'urt-her. objects of obtaining greater flexibility in the belt, as'

well as greater resiliency are obtained, and thus an economy in the motor power or greater speed of the machine is produced.

Reference is made, in further description of the invention, to the accompanying drawings, in Which- Figure 1 1sa plan of the upper surface of a piece of the belt; Fig. 2 is a side elevation of Fig. 1, showing a patternof round studs on the side face of the belt; Fig. 3 isa simi-. lar side elevation, but showin a pattern of.

diamond shaped studsinstea' of the round ones; Fig.4 is a cross section through the belt on the line ZZ of Fig. 2; and Fig. -5

is a similar cross section of Fig. 2011 the line YY. F i 6 is a cross section of Fig. 3onthe line .'X, and Fig. 7 a cross section on the line W,-W of F1g. 3. Fig. 8, a diagram on a smaller scale, shows the tensile strain on'the upper surfaceof the belt, and

compression on the lower, in passing around a pulley.

v The driving belt is made on a core, a, of. canvas im regnated or coated with a solu-- tion of in 1a rubber, gutta percha, orsimilar Specification of Letters Patent. Application-filed July-17, 1911. Serial No. 688,978.

Patented June 4, 1912.

substances or compounds thereof, and then covered all around with a fairly thickcoatingof-india rubber, b, molded in .a metal mold, and vulcanized, all in the usual manner.

of which are specially formed, arranged, and combined with the fourth pattern of a small semi-circular groove a, molded across the bottom of the belt at regular intervals of a little less than half an inch apart for an average size belt. The said grooves have been used hitherto to give greater flexibility I to the belt, which is naturally stiflf from-its thickness and construction, but the grooves alone are not satisfactory. On each side face of the belt I form round studs d, as indicated in Fig.2, or diamondshaped studs (1 as indicated in Fig. 3 and arran e themv so that two studs (for example are situated above each semi-circular But in my invention a pattern is molded on all four sides of the belt, three groove 0, and three studs above the intervening bottom surface of the belt; boundary'channels, as aforesaid being sunk between {the several studs d or d for the wise be trapped against the faces of the p111 leysand lessen adhesion. These channels communicate with the grooves c.

- On the upper surface of the belt, the pat:

tern is similarto interwoven basket-work,

the ribs projecting above the general upper surface l ne of the belt, but formed as flat topped segments 6 in five lines (for example), the-ends of each segment being sepa escape of air or rain water that would other- {v rated by the space of about half its own length from the preceding and following segments on the same line of segments. Each line of segments is similarly arranged,

but breaking oint, as it were, with its.

neighboring line or lines, theends of each segment e passing or overlappin the simi-' lar position of the ends of the ad oining, line or lines of segments. It will be seen that .the arrangement of segments e, and studsd or (Z is such that a transverse line across the highest or central part of each of three segments 6, coincides with the center of three studs 0! or d on each of the side -faces of the belt,-and also with the center 'of the intervening bottom surface of the belt, as

indicated bythe lines ZZ, F-i 2, and

'X,X of Fig. 3, and that-on this me there is the greatest depth or mass of material,

(as shown in Figs. 4 and 6) and at all such points the belt would present the greatest rigidity to bending. But next to this line of reatest ri 'dity is the line of greatest fiexlbility, being Y--Y in Fig. 2,. and WW in Fig. 3, owing to the transverse line passin through the thin parts of but two l1nes segments, through two studs on into the straight portion' of their path, thus vof its path, yet when bending. around thepulleys used the lines would assume radial instead of parallel positions, asshown in the diagram Fig. 8. Therefore, while the belt bends easily through the lines of greatest flexibility, the segments 0 between these lines being stretchedlto the greatest extent in passing around apulley willimmediately contract-t0 their normal form on passing exerting the maximum of resiliency, combined with flexibility.

What I claim and desire to secure by Letters Patent. of the United States is:

1. A driving belt for transmitting power by the frictional grip of its inclined sides upon the side faces, of a grooved pulley, having in'combination grooves cut across its under surface, a pattern of segment like hasket-work raised above thegeneral upper surface of the belt, and a pattern of studs with intervening sunken channels on each side face of the belt, substantially as and for the purpose described.

2. A driving belt for transmitting power by the frictional grip of its inclined-sides upon the side'faces of a grooved pulley, having in combination grooves cut across its under surface, and a pattern of projections above the general upper surface of the belt, the said projections being so arranged as to present alternate. maximum and .minimum masses of material in cross section, substantially; as and for the purpose described.

3. A driving belt for transmitting power by the frictional grip of its inclined sides upon the side faces of a groovedpulley, having in combination grooves cut across its under surface, and a patternof-stnds with intervening sunk channels on each side face of the belt, the said channels communicating with the said grooves, substantially as and for the purpose described.-

4. A driving bit for transmitting power by the frictional grip. of its inclined sides upon the side faces of a grooved pulley, having in combination a central core of canvas coated or impregnated with an adheslve, an

exterior coating of india rubber, said belt having sunk spacesformed in the rubber on each of its four sides so spaced and arranged as to present alternate spaces of greatest and least material at regular distances apart, substantially as and for the purpose described.

5.. A motor cycle driving beltcomprising' a central core of canvas and an external coating of india rubber, said coating having patterns molded on each of its four sides by alternate sinkings and projections of the said rubber, arranged and operating to produce regular alternating transverse l1nes of greatfor the purpose described.

In testimony whereof I have hereunto set est and least flexibility, substantially as and -my hand in presence of two subscribing witnesses.

GURT THEODOR LEONARD VON RABENAU.

Witnesses: p s JOSEPH SINCLAIR FAIRFAX H. R. FoRs'rER. 

